Definitions for "trinucleotide repeat"
a recurring pattern of three nucleotides
a sequence of three DNA building blocks (nucleotides) that is repeated a number of times in a row
Sequences of three nucleotides repeated a number of times within a stretch of DNA. Several disorders are associated with abnormally large numbers of trinucleotide repeats found within or close to genes, e.g. CAG-CAG-CAG repeats in Huntington disease.